Hmmm, interesting stuff. Hadn't heard about bringing Victor Cassadine back. He was Mikkos' brother, (and Alexis' uncle) and you're right, KatesMom, Thaao Penghlis was the same guy that played Tony DiMera on Days of Our Lives. I'll be glad to see him again.
But Sam's birth-father being a Cassadine is the interesting part. Sam definitely is already a Cassadine, because her mother Alexis (who Luke always calls Natasha, cause she was actually born Natasha Cassadine) is the illegitimate daughter of Helena's husband Mikkos and his mistress, Kristin Bergman, a Swedish opera singer. Helena hated Alexis' mother and murdered her in cold blood! Helena has always hated Alexis too, and in the early days, was always threatening to murder her as well.
So back to Sam's father. We've never been told who Sam's birth-father was. She was adopted by the McCall family, so the father who raised her was Cody McCall, who was a con artist who taught Sam how to salvage and run a con. Cody's connection with the Cassadines was that he apparently posed as a butler to the Cassadine family, and he was later hanged (by his former business partner) in the tunnels at Wyndemere Castle.
But in regard to Sam's mystery birth-father --- if he was a Cassadine and Sam's mother Alexis was a Cassadine. . . did we have a little incest going on in the Cassadine clan????